仿真模型通过数字计算机、模拟计算机或混合计算机上运行的程序表达的模型。采用适当的仿真语言或程序，物理模型、数学模型和结构模型一般能转变为仿真模型。关于不同控制策略或设计变量对系统的影响，或是系统受到某些扰动后可能产生的影响，最好是在系统本身上进行实验，但这并非永远可行。原因是多方面的，例如：实验费用可能是昂贵的；系统可能是不稳定的，实验可能破坏系统的平衡，造成危险；系统的时间常数很大，实验需要很长时间；待设计的系统尚不存在等。在这样的情况下，建立系统的仿真模型是有效的。例如，生物的甲烷化过山刷房  保定强夯 卷扬式启闭机  保定网站制作 收费岛模具 遮阳网 麻绳程是一个绝氧发酵过程，由于细菌的作用分解而产生甲烷。根据生物化学的知识可以建立过程的仿真模型，通过计算机寻求过程的最优稳态值并且可以研究各种起动方法。这些研究几乎不可能在系统自身上完成，因为从技术上很难保持过程处于稳态，而且生物甲烷化反应的起动过程很慢，需要几周的时间。但如果利用（仿真）模型在计算机上仿真，则甲烷化反应的起动过程只需要几分钟的时间。
A model expressed by a program running on a digital, analog, or hybrid computer. Physical model, mathematical model and structural model can be transformed into simulation model by using appropriate simulation language or program. As for the influence of different control strategies or design variables on the system, or the possible influence of some disturbances on the system, it is better to experiment on the system itself, but this is not always feasible. There are many reasons, such as: the experiment cost may be expensive; the system may be unstable, the experiment may destroy the balance of the system and cause danger; the time constant of the system is very large, the experiment needs a long time; the system to be designed does not exist, etc. In this case, it is effective to establish the simulation model of the system. For example, the methanation process of organisms is an oxygen free fermentation process, which produces methane due to the decomposition of bacteria. According to the knowledge of Biochemistry, the simulation model of the process can be established, the optimal steady-state value of the process can be found by computer, and various starting methods can be studied. These studies are almost impossible to complete on the system itself, because it is difficult to keep the process in a stable state technically, and the start-up process of biomethanation is very slow, which takes several weeks. However, if the simulation model is used in the computer, the starting process of methanation only needs a few minutes.